Hi
I thought it may be useful for everyone to pool information on what changes need to be made, in particular to custom settings in the wake of the new 3.1 version.
Here's one for starters:
If you join two tables and you want the search function to work properly, previously you made changes in the include/dbcommon.php file under the section:
function GetFullFieldName
Now you make these changes under the same section but in the file:
include/commonfunctions.php
See "Using JOIN SQL queries" in the help file.